Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, and non-destructive behavior. The description adds valuable context by disclosing 'No API key required,' the nature of the audit ('structural'), and the output composition (pillar scores, recommendations, brief link, CLI command). It also clarifies it is not an LLM ranking, preventing misuse.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.